Improvement in jig-saws



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1 1 8 0 8 7 Pmm AUG-15 1871 Y Iran STATES PATENT OFFICE.

ARTEIWIUS H. VHITNEY, OF ESSEX, ASSIGNOR OF ONE-HALF HIS RIGHT TO JOHNL. RANDALL, OF ALBANY, NEW YORK.

IMPROVEMENT IN JIG-SAWS.

Specification forming part of Letters Patent No. 118,087, dated August15, 1871.

To all whom it may concer/n:

Be it known that I, An'rEMUs H. WHITNEY, of Essex, in the county ofEssex and State of New York, have invented certain Improven'lents inUpright or Jig-Saws, of which the following is a full and exactdescription, reference bein ghad to the accompanying drawing making apart of this specification, in which Figure 1 is a side elevation; Fig.2, a front elevation; Fig. 3, a plan view with the table rcmoved, Fig.LI, an venlz'ngged plan view of the top of the stand and for holding theupper arm, Fig. 5, a front elevation of the same 5 and Fig. 6, anenlarged view of the adjustable tightening-connection between the twoarms.

The nature of my invention relates to the hanging and operating anupright saw between two parallel arms; and consists in devices foradjusting the movement of the saw so as to give it greater range andefficiency.

A is the frame-work, at the back end of which is the standard B, having'at its lower end two lugs or ears for receivingthe lower arm foroperating the saw. At its upper end an adjustable bearing, O, issecured-,"havin g similar ears for receiving the upper arm. D is theupper and D the lower arm, each having trunnions diagonally across themso as to throw the line-of the cut of the saw to one side of theIstandard B, so as to give the saw greater range for its work. Thesetrunnions should be arranged so as to divide the arms in such a mannerthat the long ends may be about three times the length of the shorterones. E E are screws with conical points, which pass through the ears ofthe standard and enter into corresponding holes in the ends of thetrunnions of the arms, forming bearings upon which the arms oscillatc. Fis the saw, the lower end of which is secured to the lower arm D by apin. At its upper end it is fastened to the upper arm D by thetightening-screw G. H is the adjustable tightening-connection,consisting of a rightand-left-handed screw working into the jaws h It,which are fastened to the short ends of the arms D D. I is thedriving-crank wheel, into which the wristpin J is fastened, carrying thepitman K, which connects with the lower arm D', and to which it impartsits motion. L is the pulley on the shaft of the wheel I for driving thesaw. When desirable to do so the upper end of the saw may be set forwardso as to throw it a little beyond a vertical line. This I effect bymoving the screw G in the slot in the end ofthe arm D. By means of theadjustable bea-ring O the ends ofthe arms D D can readily be broughtinto exact line with each other. The saw, as shown in the drawing, issecured to the long ends of the two parallel horizontal arms D D, eachof which is provided with three working-points, to wit, at the short endfor the adjustable connection H, at the trunnions for oscillating thearm, and at the long end where the saw is secured. All of these shouldbe arranged in a truc horizontal plane and in exact parallel lines witheach other. By this means an equal stain is kept upon the saw at everypoint of the stroke, and prevents its buckling up.77 This saw, beingcomplete within itself, can be set up without being secured to thebuilding wherein it is used. This, together with its great effectivenessand low price, makes it a most desirable adjunct to theV shops of smallmanufacturers.

I am awa-re that saws have heretofore been constructed having two pairsof arms above and below, with their trunnions arranged diagonally acrossthem and working upon two standards. This arrangement, while it involvesa greater cost of construction than mine, does not admit of so great arange of work, as it will prevent the sawing of long curves by reason ofthe material striking in its course one of the standards. Therefore I donot claim, broadly, such construe tion; but

What I claim as my invention is- 1. The arms D D', having theirtrunnions arranged diagonally across them, as herein described, and forthe purposes hereinset forth.

2. The adjustable bearing C, when arranged in relation to the standard Band arms D D, a-s and for the purpose herein set forth.

3. The combination of the standard B, adjustable bearing C, arms D D,screws E E, saw F, tightening-screw G, adjustable tightening-connectionH, crank-wheel I, wrist-pin J, and pitman K, when constructed andarranged as herein described and for the purposes specified.

ARTEMUS H. VHITNEY.

Vitnesses:

WILLIAM H. Low, S. J. HAIGHT.

